Diving Exclusions and Qualifications

The examination of prospective divers, sports scuba divers, underwater photographers and diving instructors should include the pertinent aspects of present and past history, review of systems and physical examination directed and designed to specifically detect those conditions that place a person in jeopardy for the following:

The physician should sign a certificate stating he “can find no contra-indication to diving” rather than “the diver is fit to dive”.

The obvious reasons why a person should not be allowed to dive are as follows:

Disorders that lead to altered consciousness

Disorders that inhibit the “natural evolution of Boyle’s Law”

Disorders that may lead to erratic and irresponsible behavior.

Absolute Contraindications

Inability to equalize pressure in the middle ear by auto-inflation. This may be due to a correctable problem such as polyps, nasal septal deviation or coryza in which case the diver can be reevaluated after correction of the problem.

Perforation of the tympanic membrane. Until fully healed or successfully repaired with good Eustachian tube function, diving is contraindicated.See http://www.merck.com/pubs/mmanual/section7/chapter84/84h.htmhttp://www.audiologynet.com/tympanoplasty.html

CONCLUSIONS: Stapedectomy does not appear to increase the risk of inner earbarotrauma in scuba and sky divers. These activities may be pursued withrelative safety after stapes surgery, provided adequate eustachian tubefunction has been established.

Neurological

History of Seizure disorder: After head injury, disallow diving during that period of time that the diver is at risk for seizures.

History of spinal cord injury, disease or surgery with residual sequelae. This includes a history of having had Type II neurological DCS with permanent neurological deficits.

A history of unexplained syncopal episodes, whether cardiovascular or neurogenic.

Peripheral neuropathies are disqualifying.

Heart

Coronary artery disease: Because of the need for cardiac reserve in an in-water emergency, the carrying of tanks, donning of equipment, swimming against a current represent significant stresses. A history of myocardial infarction is considered a disqualification for sport diving; there are unusual cases of exceptional rehabilitation after dilations and revascularization procedures.

Intracardiac shunts (particularly large right to left shunts), PFO

Asymmetric Septal Hypertrophy: this can lead to sudden loss of consciousness.

Valvular stenosis: Can lead to sudden loss of consciousness.

Congestive heart failure

Hypertension-Controlled can dive but drugs that limit exercise response (beta blockers) need to be evaluated. OK if person can reach 13 METS on the treadmill. *(See below)

Angina controlled with medications is disqualifying.

Coronary spasm is disqualifying ( can be cold or exercise induced).

Silent ischemia on Holter- disqualifying

Status post op CAB with no symptoms and negative treadmill OK to dive if can reach 13 METS. *METS are multiples of resting O2 consumption. Eight to nine METS equal 1 knot or 100 feet per minute swimming. (70% maximal). Thirteen METS equal 40 ml./kg./minute.. One cannot swim at 1 knot so don’t dive in an environment requiring more. In currents of 7-8 knots, it’s best to go with the flow. (p=KpV2).

Mitral regurgitation, aortic insufficiency with no left ventricular dysfunction can dive

Aortic and mitral stenosis are disqualified

Mitral valve prolapse with no symptoms such as chest pain, syncope, dyspnea can dive

Intracardiac defects, right and left should be disqualifying.

Arrhythmias

Heart block that is unassociated with other cardiac dysfunction

Primary-can dive after the usual exercise evaluation

Higher grades of block are disqualifying

Right bundle branch block can dive

Left bundle branch block can dive with a normal thallium and angiogram test.

Wolf-Parkinson-White syndrome is disqualifiedSupraventricular tachycardia can dive 6 months after the causes are removed

Lungs

Spontaneous pneumothorax; A history of previous spontaneous pneumothorax carries a high incidence of recurrence and the candidate must be advise against compressed-gas diving.. A pneumothorax that occurs under water or in a chamber can become a “tension” pneumothorax on ascent and be immediately life-threatening as the pleural cavity expands because of Boyle’s Law.

Traumatic or surgical pneumothoraces can be allowed to dive after appropriate clearance from a diving physician, chest surgeon or pulmonary disease specialist.

Significant obstructive pulmonary disease

Air-containing pulmonary cysts or blebs which can trap air and lead to local pulmonary overpressure accident during decompression (Ascent).

Asthma in the active phases. May dive when the pulmonary functions have returned to normal at rest. The mid-expiratory flow needs to return to baseline.

Sickle cell disease or trait: There is the remote possibility that the sport diver will breathe a hypoxic mixture of gas or start the sickling process with exertion in cold water or with bubbles during decompression-thereby leading to sickling->hypoxia-> and a vicious cycle of more hypoxia and sickling. (See section on endocrine and metabolic problems. )

Dental Considerations:

Major oral surgery with prosthetic devices

Carious teeth

Osteomyelitis of the mandible

Osteoradionecrosis of the jaw

Psychiatric Considerations

Persons with a history of panic attacks

The dragooned, reluctant diver

The “macho” buccaneer

The counter-phobe

Truly psychotic disorders

Chronic substance abuse, including alcohol

*Pregnancy or intention to become pregnant*

(See Women and Diving)

Relative ContraindicationsENT

Recurrent otitis externa or media

Eustachian tube dysfunction

History of Tympanic Membrane perforation

Significant hearing loss in one ear

Midface fracture

Facial nerve paralysis

Full mouth prosthetic devices

Head and neck radiation

Migraine, severe (scotomata, CNS symptoms and stroke after diving)

Ophthalmic

Corrective lenses can dive, including contacts

Lens implants can dive when completely healed (6 weeks).

Radial Keratotomy can dive when healed (3 months).

Glaucoma can dive if vision is not affected

Neurologic

Migraine: Those persons who have migraine with any of the following should not dive: Aura, impairment of one of the senses, nausea and vomiting or photophobia.

Head injuries: Persons can be cleared for diving following head injuries if they have no history of:

intracranial hemorrhage

Brain contusion

Unconsciousness lasting 24 hours or longer

Unconsciousness lasted 2-24 hours and the person has been seizure free for 2 years

Unconsciousness lasted less than 2 hours and the person has a normal neurological workup.

Person is neurologically normal one year after experiencing 3-4 weeks of amnesia.

Simple febrile seizures; Seizures accompanying febrile episodes below the age of 6 with no history of abnormal neurological exams, seizures of longer than 15 minutes duration or nonfebrile seizures in family members.

Successful brain surgery (tumor or aneurysm) with no residuals or sequelae after 3 months (with the approval of the surgeon)

Other conditions

Diabetes Mellitus: Insulin dependent diabetics represent a gamut of severity; the more brittle diabetic who should not dive and a less serious one which should not increase the hypoglycemia risk enough to exclude diving. The long-standing diabetic who has lost the normal defense mechanism against hypoglycemia should not dive. Newer methods for testing and steps to regulate blood sugar can eliminate the risk of hypoglycemia. As diabetics are more prone to coronary disease, a good physical examination, and exercise testing when indicated, can reduce the risk for a heart problem while diving.

Cardiovascular System: Diagnoses potentially rendering the person incapable of performing the exertional requirements necessary to meet the needs of diving. Formal stress testing with a minimum criterion of *13 METS needed for qualification.

Pulmonary System: Patients with a thoracotomy can be certified for diving after thorough evaluation by a thoracic surgeon knowledgeable of diving medicine. Divers with pulmonary barotrauma may return to diving after no less than a three month wait and a certification from a diving physician that there is no air trapping.

Gastrointestinal System:

Reflux disease and gastric outlet obstruction need to be evaluated prior to qualification.

A history of bowel obstruction is not disqualifying if the person is asymptomatic 6 months after corrective surgery.

A hernia that includes bowel is disqualifying until surgically repaired.